The AllAboard project, part of Orange's Data For Development contest, used 2.5 billion phone calls from 5 million residents of Abidjan. As a result, two new bus routes were created, and an existing one extended.

Although the big reviews of Samsung's "good not great" smartphone came out yesterday, the Korean firm says it is struggling with demand for the S4. AT&T customers will get their phone on Saturday, as planned, but providers Sprint and T-Mobile have had to delay their on-sale dates.

With rumors that Facebook has placed a $1 million price tag on video advertising, Sheryl Sandberg explains just why the social media firm values mobile advertising so highly. But will marketers agree with her?